Safety sheave block



2 Sheets-Sheet March 13, 1928.

l W. H. MCKISSICK lSAFETY sHEAvE BLOCK Filed May 1e. 1927 ATTORNEY March13, i928.

1,662,320 w. H. McKlsszcK SAFETY SHEAVE BLOCK Filed May le. 1927 2sheets-sheet 2 ATTORNEY Patented Mar. 13, 1928.

SAFETY SHEAVE BLOCK.

Applicatiyon led May 16, 192'?. Serial No. 191,636.

This invention lrelates to new and useful improvements in safety sheaveblocks.

"The object of thek invention is to kprovide a sheave block comprisinghousing members i having line guards and arranged so that by partiallyrotating one member, the guards are separated and the housing is openedfor the removal or insertion ofthe cable lines.

Av furtherobject of the invention isV to provide a Vsalfetysheavebloclrcompiising a pair-of housing-"members centrally pivotedV on the.sheav'e 'bolt or axle and each Carrying guards, substantially enclosing`the'cable lines,`whereby upona partial rotationof one of the housingmembers. its guards are displacedffrom those of the other'member and theblock opened.'

Another object of 'the vinvention is to mi provide means for fasteningone of the housing members and the axle against relative rotation,`while the other housing member is `mounted to rotate. F

A construction designed to carry out the invention will be hereinafterdescribed, together with other features of the invention. The inventionwillbe more readily linderstood from a reading of the followingspecilication' and by reference to the accompanying drawings, in whichis shown an example of theinventionand wherein:

Fig. 1 is a side elevation of a sheave block constructed tion,

'.Fig. 2 is anenlarged llongituidnal sectional view taken onthe'line 2f2of Fig. 1, Fig.- 3 is anenlarged sideelevation showing the block in itsopen position,

Fig. 4 is a cross-sectional view taken on the line 4-4 of Fig'. 1, y

Fig-.5 is a vperspective view of the top guards, l

Fig. 6 is a view of the spacer spool partly in elevation and partly insection, andV Fig. 7 is a detail showing the axle and housing memberlocking connection.

In the drawings the numeral 10 designates an axlehaving an enlargedcentral bearing portion on which a shea-ve 11 is journaled and providedwith .1 reduced trunnions 12 having their outer ends screw-threaded. Ahousing comprising side plates 13 and side in accordance with my invenbars l14, together with guard flanges 15 at the ends of the side plates,is mounted on the axle 10.

In describing the block, it will be assumed that it occupies a verticalposition and it will, therefore, be referred to as having top, bottom,side and end portions, but such Vterms are used merely as descriptivedesignations and .do not limit the block to use in a vvertical `positionas it may be used in a horizontal or any other desirable position.`

The side bars 14C are suitably fastened to the outer faces of the plates13, centrally thereof.Y as byrivets 16. The bars extend from the top tothe bottom of the housing and the side plates are preferably cut off atan angle of about 450 on lines extendingr from the ends of the barsvtothe guard flanges 15 at the top andy bottom of the housing. Thisgives the block a symmetrical shape and eliminates surplus material.lhowever. the shape of the block is imma-l terial and the plates may beformed as is found most desirable. The plates and fianges being rivetedtogether constitute two housing members which I have designated as A andThese members are mounted on the trunnions 12 of the axle with theplates bearing against the enlarged central portion 'of said axle oneach side of the sheave.

At the lower end of the block a bottom becket bolt 17 passes through themembers A and Band a spool 18 mounted on the bolt between thevplates 13serves as a spacer for-thebottom of theblock. A U-shaped bottom becket19 straddles the housing and is mounted on said bolt, which is held inplace by a nut 20. An upper becket bolt 21 passes through the Vtoplportions of the housing members A and B and is suspended in an upperbecket 22 straddling the housing and retained by a nut 23 on the bolt.It will be seen that by removing the nuts 2O and 23 the bolts 17 and 21may be pulled out and the beclrets removed.

A very important element of the block is its safety features. The guardflangesl 15. which are directedv inwardly from the plates 13 andpreferably at rightangles thereto, are one of the safety features.'These flanges being directed toward each other and extendingtransversely of the sheave and longitudinally on each side of the1ongitudinal axis of the block, cover the cable line which passesthrough .the bloclrand prevent the workman eatclingj his fingerstherein. The flanges may be spaced apart to form gaps 24, as is bestshown in Fig. 4, or they may come eloserftogether.

Another safety measure is carried out by providing guard blocks 2.) atthe' top'of tlie housing. Two of these blocks are provided,.

each being riveted to the inner side of one ofthe plates-.13 andhavmgacentralaperf ture 26 for receiving the upper becket bolt 21;

The blocks are shaped to fit the contour. of. the uppery ends ofthesideplates. andeach bloclris beveled at 27.` as is shown in=.lj`igs\.` 3 andlf, at their lower. endsso asto provide.

notches for the cablezlines and.. alsoto.V obviate abrupt; corners at.these points.

the top of. the housing, only sufficient. openings beingleft betweenthe. guardsandt-he:

f flanges 15 for the. passageof thef cable llnes. VThe workmans fingersare thus protected. Inorder to open the. bloclrso that the cable.

line may be removed or insertechthe-becket bolts 17 and 21 andthebeckets 19 and 22 are removed. ThisA leaves the housing.. members Aand B free to rotate; However it: is necessary to turn the member A atright angles to the member B'tomismatch the. flanges 1'5A and the blocks25. Todo this the member 13 hasa leyslot' 28 receiving a keyy 29 seatedin one of thetrunnions 12 of the. axle 10, to keep the. axle and theother member B from rotating. By this `arrangement the member.

A` may. be readily swung,v to the position*- shown in Fig. 3. y

When the. housingmember A is rotated to open the housing, one of theblocks 25. is carri'ed awayfrom the other and the guard flanges 15 ofthe member A are displaced from the flanges 15 of the member B.' Thebevels 27A are necessary in the4 formV illustrated to provide openingsYfor/the passage of the cable linesl under the guard flanges when theblock is opened as is shown iniFig` 3.' The cable line maybefreelyapplied to,

or. removed .from the' open sheave block as; ample clearance will beprovided; The sheave block is easy to lclose and fasten. The guard.blocks 25' overhangingthe sheave 11.

' andr coacting with the guard flanges is a very' important feature ofthe. device and guards overhangA the. sheave 11 and. close..

ent block may be opened with a quarter rotation and is more compact instructure than the. eccentric block.

Various changes inthe size1and'shape of the different parts, as well asmodifications and alterations, may be made within the scopeoftheappendedlclaims.

What I claim, is:

1l. Inasafety sheave block, a housing comprising two members each havinginturned guard flanges on opposite sides of its longitudinal axis, the.guard flangesof. onemember being normally alinedlfand registered with;the guard. flanges. of.` the otherY memberyone of. said 4membersbeingcentrally piVOtedand. rotatable with. relation .to the. other,member-.- to move the flanges out.. of., registration, andopenthehousing,.a sheave journaledl in the:

housing.,. and means. for fasteningthe hous1- ing members in theirclosed position.

2.. Ina safetysheave block,.a housingeomprisingtwo members each. havinginturned. guard flangeson opposite: sidesz-ofits-.longL tudinal axis,the guard flanges ofone mem? ber: being normally alined-i andfregisteredi with the guard'flanges ofthe other. member, an axle.mounted' in said members. centrallyl between the flanges of'each, oneotsaid'memf bers being rotatable with. relation to.. the. other memberand havingsaidaxle asits pivot, whereby the flanges aremoved outofregistration andv the housing Vis opened, a sheave journaled on the.axle, and means. for, fastening the housing members in their. closedposition. l

3. In a safety. sheave: block, Va housing; comprising two members eachhavingufinturned guard flanges on opposite sides of. its longitudinalaxis, the guard flanges `oflone member being normally ali'ned and!`regis-f tered with the guard. flangesof the-other member, an axle`mounted, in said; members centrallyfbetween the flanges o each, one ofVsaidrmembers beingrotatablefwith relation to the Yother memberandvhaving said'axle as its pivot, whereby the flanges are moved out ofregistrationandithe housing isopened,a

sheave.journaledl on the axle,.Y guard blocks secured -to the upperlends of the housing members and bridging thel space above the sheave,andl means for fasteningV the housing members in their closed position.

4. In. asafety sheave'blck, a pair of side plates having longitudinalinturned'flan es, side bars secured longitudinally to the sideplates'b'etween'their flanges, the plates being fastened to the'barsandeonstituting therewith housing members, an axle extendin throughthehousing members centrallyfbetween their flanges, a sheave journaledon the axle, guard blocks overhanginggthe sheave and one secureditoeachhousing'mem# ber, and means' for suspending the housin 5. In asafety'sheave bloelr, a pair of si' e platesV having longitudinalinturned flanges,

` side bars secured longitudinally to the side nion and the otherhousing member being roplates between their flanges, the plates beingtatable upon its trunnion, a sheave mounted 10 fastened to the bars andconstituting there on the axle between side plates, guard blocks withhousing members, an axle extending overhanging the sheave betweenhousing 5 through the housing members centrally bemembers, and becketssecured to opposite tween their flanges, trunnions of the aXle ends ofthe housing. penetrating the housing members, one of the In testimonywhereof I allix my signature. housing members being fastened on itstrunv WILLIAM H. MCKISSICK.

